<?php
/**
 * 字符串截取，支持中文和其他编码
 * @static
 * @access public
 * @param string $str 需要转换的字符串
 * @param string $start 开始位置
 * @param string $length 截取长度
 * @param string $charset 编码格式
 * @param string $suffix 截断显示字符
 * @return string
 */
function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true){
    if(function_exists("mb_substr")){
        if($suffix && strlen($str)>$length){
            return mb_substr($str, $start, $length, $charset)."...";
        }else{
            return mb_substr($str, $start, $length, $charset);
        }
    }elseif(function_exists('iconv_substr')) {
        if($suffix && strlen($str)>$length){
            return iconv_substr($str,$start,$length,$charset)."...";
        }else{
            return iconv_substr($str,$start,$length,$charset);
        }
    }
    $re['utf-8']   = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
    $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
    $re['gbk']    = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
    $re['big5']   = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
    preg_match_all($re[$charset], $str, $match);
    $slice = join("",array_slice($match[0], $start, $length));
    if($suffix && strlen($str)>$length){
        return $slice."...";
    }else{
        return $slice;
    }
}

/**
 * 获取数据的分类名称
 * @param $pid 位置ID
 */
function getCategoryName($id, $tbName = MODULE_NAME)
{
	if (!$str = M("$tbName")->where("id =$id ")->getField('name')) {
		$str = '==顶级==';
	}

	return $str;
}








